We are using the nRF54L15 chip in a new product that is essentially a sniffer. We periodically turn the receiver on for 5 to 10 seconds to sniff for BLE advertisements from a curated list of devices. Using the power profiler (or a JouleScope), we see that, under certain conditions, the current draw of our board drops by about 3.5mA for a period of 3ms to a few hundred ms periodically during our "receive window". During these times, we know that we are missing some ads. The 3.5mA drop in current seems to indicate that the receiver is shut down, then restarted (automagically it seems). We have correlated this (convincingly) to times when my Samsung Galaxy Android phone has BT enabled and the screen is not dark. Is there something about the Nordic receiver and/or internal overload protection that could be causing this? FWIW, this happens with an older custom nRF52832 board of ours. When I measure multiple sniffers in parallel, the dropouts are synchronized even if the receive windows are not, leading us to believe the stimulus is external.
Any thoughts, ideas, or experience is greatly appreciated.
